Table 1.

Descriptive characteristics of study population

Characteristic	PCOS-exposed offspring (N = 20 988)		PCOS-unexposed offspring (unrelated) (N = 200 816)		PCOS-unexposed offspring (cousins) (N = 17 295)
	n	%	n	%	n	%
Sex of offspring
Male	10 779	51.36	102 528	51.06	8940	51.69
Female	10 209	48.64	98 288	48.94	8355	48.31
Child's year of birth
1973–1984	314	1.5	3317	1.65	817	4.72
1985–1989	539	2.57	6869	3.42	1151	6.66
1990–1994	1333	6.35	16 739	8.34	2059	11.91
1995–1999	2034	9.69	23 402	11.65	2213	12.8
2000–2004	3398	16.19	38 105	18.98	3242	18.75
2005–2009	6397	30.48	57 488	28.63	4284	24.77
2010–2013	6973	33.22	54 896	27.34	3529	20.4
Maternal age at child's birth (years)
<20	540	2.57	6296	3.14	722	4.17
20–24	3847	18.33	43 570	21.70	4158	24.04
25–29	7108	33.87	74 121	36.91	6086	35.19
30–34	6486	30.90	57 995	28.88	4637	26.81
35+	3007	14.33	18 834	9.38	1692	9.78
Mother's region of birth
The Nordic countries	16 595	79.07	167 284	83.30	15 432	89.23
Outside the Nordic countries	4393	20.93	33 532	16.70	1863	10.77
Maternal highest achieved educationa
Primary and secondary education	2152	10.3	19 650	9.85	2019	11.72
Upper secondary education	9087	43.47	88 465	44.33	8267	47.98
Post-secondary/post-graduate education	9664	46.23	91 424	45.82	6945	40.31
Maternal lifetime history of any psychiatric diagnosis	4660	22.2	31 294	15.58	2914	16.85
Paternal lifetime history of any psychiatric diagnosis	2318	11.04	20 898	10.41	1845	10.67
Offspring psychiatric disorders
ADHD	681	3.24	5440	2.71	602	3.48
ASD	256	1.22	1765	0.88	202	1.17
TD/CTD	38	0.18	282	0.14	30	0.17

ADHD, attention-deficit/hyperactivity disorder; ASD, autism spectrum disorders; PCOS, polycystic ovary syndrome; TC/CTD, Tourette disorder/chronic tic disorder.

^aCategories do not add up to the total number because maternal education is missing for 0.6% of children.